Thread Check Inc. offers high precision plain reversible plug gages in class XXX tolerance from .127mm up to 25.4mm for checking hole sizes and calibrating measuring equipment. Plain reversible plug gages are made of quality E52100 tool steel hardened to Rockwell C62&dash;64. Class XXX Gagemaker tolerances can be supplied in plus, minus, or master tolerances in inch and metric. All pin gages are 2.0 in length. All gages are ground and lapped to a 5 micro inch finish or better. All gages are traceable to the National Institute of Standards and Technology. Carbide plain reversible plug gages priced on request. Long Form Calibration available at an additional charge.